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The midlands teams meet for the second time in two weeks after a 1-22 apiece draw in Portlaoise in the last round-robin game.
Eddie Brennan's men needed a late Eoin Gaughan point to salvage their unbeaten status, after winning their three matches to that stage.
A home loss to Kerry was Westmeath's only blip.
The winner of this game earns a place in the Leinster championship next year but also progress to face Dublin in a preliminary quarter-final, while Cork await the losers.
Read Conor Neville's LANDLOCKED IN BATTLE: THE MIDLANDS BALANCE OF POWER
RTÉ hurling analyst Michael Duignan reckons there will be little between the sides.
"Both teams' form has been very strong with Laois averaging over 30 points a game, Westmeath 26," he said.
"They are two very attacking teams but Laois' form has been that little bit stronger and they have a better spread of scorers.
"Westmeath were beaten in the final last year and they won’t go down without a massive fight but I think Laois might take it."